Tander's Dallara F307 Mercedes Benz became stuck between gears, and an unsuspecting Caratti piled into the back of her, putting both out of the race.
“It just didn't have any drive, and unfortunately Nathan wouldn't have known that I was not going to get out of the corner like normal, so it was a really sad way to end the weekend for both of us,” Tander said.
Earlier in the race, Caratti had almost clashed with Tander when he tapped the TanderSport car under brakes and sent her sideways, though both were able to maintain their respective positions.
The winner out of all the final lap drama was Mat Sofi – who suddenly found himself on the podium for Astuti Motorsport after a turbulent weekend, jumping from sixth to third on the final lap.
“I was optimistic for today's race and getting up there,” he said, “and I knew we had the speed to be up there, but obviously I was quite fortunate to get the podium in the end.”
Chris Gilmour then put his Dallara F304 into fourth for an excellent finish as the first National Class runner, while Jesse Wakeman likewise steered through the carnage to put his R-Tek Motorsport Dallara F301 into fifth.
Steve Morcombe took sixth, Jonathon Grant seventh and John Mills finished in eighth.
While carnage occurred behind him, Martin wouldn't let his round win be overshadowed.
“I had quite a reasonably good start so we had a good battle into turn one but I had to let him go otherwise I was going to go across the chicane,” he explained. “It's been great to capture the round win and take the fastest lap in every single session, so it shows just how much pace we had over the entire weekend.”